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Therefore, in order to our ability in listening, words that frequently appear in some popular science should be carefully studied.

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Besides, if we have a close examination of the reports, we may find that they are often divided into different parts or paragraphs on the , the test or experiment procedures, the observations, the findings or results and so on.

This kind of knowledge also helps us in following the ______ developments in science.

六个基本视图之间的投影关系（）、（）、（）。

为了合理利用图幅，国家标准允许将各基本视图自由配置，不按标准配置的基本视图为（）。